Achievable DoF-Delay Trade-Offs for the $K$ -user MIMO Interference Channel With Delayed CSIT
| Autor: | Adrian Agustin, Josep Vidal, Marc Torrellas |
|---|---|
| Přispěvatelé: | Universitat Politècnica de Catalunya. Departament de Teoria del Senyal i Comunicacions, Universitat Politècnica de Catalunya. SPCOM - Grup de Recerca de Processament del Senyal i Comunicacions |
| Rok vydání: | 2016 |
| Předmět: |
Interference alignment
Ràdio -- Transmissors i transmissió Transmission delay Computer science Delayed channel state information MIMO 050801 communication & media studies Interference channel 02 engineering and technology Library and Information Sciences Precoding MIMO systems Scheduling (computing) 0508 media and communications Control theory 0202 electrical engineering electronic engineering information engineering Sistemes MIMO Radio--Transmitters and transmission Computer Science::Information Theory 05 social sciences Transmitter 020206 networking & telecommunications Enginyeria de la telecomunicació [Àrees temàtiques de la UPC] Computer Science Applications Degrees of freedom Channel state information Information Systems Communication channel |
| Zdroj: | UPCommons. Portal del coneixement obert de la UPC Universitat Politècnica de Catalunya (UPC) Recercat. Dipósit de la Recerca de Catalunya instname |
| ISSN: | 1557-9654 0018-9448 |
| DOI: | 10.1109/tit.2016.2616348 |
| Popis: | ©2016 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works. The degrees of freedom (DoFs) of the K-user multiple-input multiple-output (MIMO) interference channel are studied when perfect, but delayed channel state information is available at the transmitter side (delayed CSIT). Recent works have proposed schemes improving the DoF knowledge of the interference channel, but at the cost of developing transmission involving many channel uses (long delay), thus increasing the complexity at both transmitter and receiver side. This paper proposes three linear precoding strategies, limited to at most three phases, based on the concept of interference alignment, and built upon three main ingredients: delayed CSIT precoding, user scheduling, and redundancy transmission. In this respect, the interference alignment is realized by exploiting delayed CSIT to align the interference at the non-intended receivers along the space-time domain. Moreover, a new framework is proposed where the number of transmitted symbols and duration of the phases is obtained as the solution of a maximization problem, and enabling the introduction of complexity constraints, which allows deriving the achievable DoF as a function of the transmission delay, i.e., the achievable DoF-delay trade-off. Finally, the latter part of this paper settles that the assumption of time-varying channels common along all the literature on delayed CSIT is indeed unnecessary. |
| Databáze: | OpenAIRE |
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